Preparation method of large-particle aluminum gallate fluorescent powder

A technology of aluminum gallate and phosphor, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as waste of labor, poor photochromaticity, and low yield

Pending Publication Date: 2020-05-19
英特美光电(苏州)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As its application becomes more and more extensive, the requirements for its performance are getting higher and higher, especially the demand for high-power LEDs in the market is also increasing; however, there are still some problems with high-power LEDs: such as poor aging performance , poor light color consistency, low light efficiency
The common methods to increase the particle size mainly include secondary sintering, sieving powder, etc.; secondary sintering not only wastes labor but also does not save energy; sieving powder has low yield and time-consuming

Method used

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  • Preparation method of large-particle aluminum gallate fluorescent powder
  • Preparation method of large-particle aluminum gallate fluorescent powder
  • Preparation method of large-particle aluminum gallate fluorescent powder

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preparation example Construction

[0018] The preparation method of the large particle alumino-gallate phosphor of the present invention comprises the following steps: (a) adding boric acid or borate to the raw material of the alumino-gallate phosphor and mixing to obtain the first mixture; (b) adding the The first mixture is placed in a reducing atmosphere at 1500-1620° C., sintered, and cooled to obtain a sintered product; (c) the sintered product is subjected to roll-to-roll, pickling, coating, drying and sieving. By adding boric acid or borate to the aluminum gallate phosphor raw material for subsequent high-temperature sintering, no secondary sintering is required, no additional process steps are required, and large-scale production is possible; D can be directly prepared 50 It is a large-grained alumino-gallate phosphor powder of 20-30 microns; and compared with the conventional method, the luminous intensity of the obtained large-grained alumino-gallate phosphor powder does not decrease, and the aging per...

Embodiment 1

[0022] This embodiment provides a method for preparing a large-particle aluminum gallate phosphor, which includes the following steps:

[0023] (a) 1g lithium tetraborate is added to 10kg homogeneously mixed aluminum gallate phosphor raw material ([Y 3 (AlGa) 5 o 12 : Ce 3 + ]), mixed in a conical mixing tank for 5h to obtain the first mixture;

[0024] (b) placing the first mixture in a corundum crucible, performing high-temperature sintering at 1620° C. in a reducing atmosphere for 2 hours, and cooling to obtain a sintered product;

[0025] (c) After the sintered product is taken out, carry out double roll four times, acid wash once, water wash 10 times, coat once, dry at 150°C for 12 hours and pass through a 400 mesh sieve (roll roll, pickling, water wash, Coating, etc. are existing conventional post-processing steps); to obtain large particle aluminum gallate [Y 3 (AlGa) 5 o 12 : Ce 3+ ] Phosphor, D 50 =20~21μm (specific performance data are listed in Table 1). ...

Embodiment 2

[0027] This embodiment provides a method for preparing a large-particle aluminum gallate phosphor, which is basically the same as that in Example 1, except that in step (a), 5g of lithium tetraborate is added to 100g of evenly mixed aluminum Gallate phosphor raw material ([Y 3 (AlGa) 5 o 12 : Ce 3+ ]) in; large particles of aluminum gallate [Y 3 (AlGa) 5 o 12 : Ce 3+ ] Phosphor, D 50 =25~26 μm; the luminous intensity is 98.83% of the luminous intensity in Example 1.

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Abstract

The invention relates to a preparation method of large-particle aluminum gallate fluorescent powder. The preparation method comprises the following steps: (a) adding boric acid or borate into an aluminum gallate fluorescent powder raw material, and carrying out mixing to obtain a first mixture; (b) placing the first mixture in a reducing atmosphere at 1500-1620 DEG C, and carrying out sintering and cooling to obtain a sintered product; and (c) carrying out roller alignment, acid pickling, film coating, drying and sieving on the sintered product. According to the invention, the boric acid or borate is added into the aluminum gallate fluorescent powder raw material for subsequent high-temperature sintering, secondary sintering is not needed, process steps do not need to be increased, and large-scale production can be achieved; the large-particle aluminum gallate fluorescent powder with D50 of 20-30 microns can be directly prepared; and compared with a conventional method, the luminous intensity of the obtained large-particle aluminum gallate fluorescent powder is not reduced, and the aging property of the fluorescent powder is not reduced.

Description

technical field [0001] The invention belongs to the technical field of LED fluorescent powder, and in particular relates to a preparation method of large particle aluminum gallate fluorescent powder. Background technique [0002] At present, LED light source is the most common kind of light source. As its application becomes more and more extensive, the requirements for its performance are getting higher and higher, especially the demand for high-power LEDs in the market is also increasing; however, there are still some problems with high-power LEDs: such as poor aging performance , Poor light color consistency and low light efficiency. In order to overcome these problems, one method is to use remote luminescent materials so that they do not directly contact the LED chip and avoid the influence of heat on the luminescent materials; the other is to seek luminescent materials suitable for high-power LEDs - large particle phosphors The application of (20 ~ 30 microns). [00...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C09K11/80
CPCC09K11/7774C09K11/778
Inventor刘军周卫新顾竟涛
Owner英特美光电(苏州)有限公司